1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * debugfs ops for the L1 cache
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2006 Paul Mundt
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
7*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
8*4882a593Smuzhiyun * for more details.
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/debugfs.h>
13*4882a593Smuzhiyun #include <linux/seq_file.h>
14*4882a593Smuzhiyun #include <asm/processor.h>
15*4882a593Smuzhiyun #include <linux/uaccess.h>
16*4882a593Smuzhiyun #include <asm/cache.h>
17*4882a593Smuzhiyun #include <asm/io.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun enum cache_type {
20*4882a593Smuzhiyun CACHE_TYPE_ICACHE,
21*4882a593Smuzhiyun CACHE_TYPE_DCACHE,
22*4882a593Smuzhiyun CACHE_TYPE_UNIFIED,
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
cache_seq_show(struct seq_file * file,void * iter)25*4882a593Smuzhiyun static int cache_seq_show(struct seq_file *file, void *iter)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun unsigned int cache_type = (unsigned int)file->private;
28*4882a593Smuzhiyun struct cache_info *cache;
29*4882a593Smuzhiyun unsigned int waysize, way;
30*4882a593Smuzhiyun unsigned long ccr;
31*4882a593Smuzhiyun unsigned long addrstart = 0;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /*
34*4882a593Smuzhiyun * Go uncached immediately so we don't skew the results any
35*4882a593Smuzhiyun * more than we already are..
36*4882a593Smuzhiyun */
37*4882a593Smuzhiyun jump_to_uncached();
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun ccr = __raw_readl(SH_CCR);
40*4882a593Smuzhiyun if ((ccr & CCR_CACHE_ENABLE) == 0) {
41*4882a593Smuzhiyun back_to_cached();
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun seq_printf(file, "disabled\n");
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (cache_type == CACHE_TYPE_DCACHE) {
48*4882a593Smuzhiyun addrstart = CACHE_OC_ADDRESS_ARRAY;
49*4882a593Smuzhiyun cache = ¤t_cpu_data.dcache;
50*4882a593Smuzhiyun } else {
51*4882a593Smuzhiyun addrstart = CACHE_IC_ADDRESS_ARRAY;
52*4882a593Smuzhiyun cache = ¤t_cpu_data.icache;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun waysize = cache->sets;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun /*
58*4882a593Smuzhiyun * If the OC is already in RAM mode, we only have
59*4882a593Smuzhiyun * half of the entries to consider..
60*4882a593Smuzhiyun */
61*4882a593Smuzhiyun if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
62*4882a593Smuzhiyun waysize >>= 1;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun waysize <<= cache->entry_shift;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun for (way = 0; way < cache->ways; way++) {
67*4882a593Smuzhiyun unsigned long addr;
68*4882a593Smuzhiyun unsigned int line;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun seq_printf(file, "-----------------------------------------\n");
71*4882a593Smuzhiyun seq_printf(file, "Way %d\n", way);
72*4882a593Smuzhiyun seq_printf(file, "-----------------------------------------\n");
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun for (addr = addrstart, line = 0;
75*4882a593Smuzhiyun addr < addrstart + waysize;
76*4882a593Smuzhiyun addr += cache->linesz, line++) {
77*4882a593Smuzhiyun unsigned long data = __raw_readl(addr);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun /* Check the V bit, ignore invalid cachelines */
80*4882a593Smuzhiyun if ((data & 1) == 0)
81*4882a593Smuzhiyun continue;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun /* U: Dirty, cache tag is 10 bits up */
84*4882a593Smuzhiyun seq_printf(file, "%3d: %c 0x%lx\n",
85*4882a593Smuzhiyun line, data & 2 ? 'U' : ' ',
86*4882a593Smuzhiyun data & 0x1ffffc00);
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun addrstart += cache->way_incr;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun back_to_cached();
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return 0;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
cache_debugfs_open(struct inode * inode,struct file * file)97*4882a593Smuzhiyun static int cache_debugfs_open(struct inode *inode, struct file *file)
98*4882a593Smuzhiyun {
99*4882a593Smuzhiyun return single_open(file, cache_seq_show, inode->i_private);
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun static const struct file_operations cache_debugfs_fops = {
103*4882a593Smuzhiyun .owner = THIS_MODULE,
104*4882a593Smuzhiyun .open = cache_debugfs_open,
105*4882a593Smuzhiyun .read = seq_read,
106*4882a593Smuzhiyun .llseek = seq_lseek,
107*4882a593Smuzhiyun .release = single_release,
108*4882a593Smuzhiyun };
109*4882a593Smuzhiyun
cache_debugfs_init(void)110*4882a593Smuzhiyun static int __init cache_debugfs_init(void)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun debugfs_create_file("dcache", S_IRUSR, arch_debugfs_dir,
113*4882a593Smuzhiyun (void *)CACHE_TYPE_DCACHE, &cache_debugfs_fops);
114*4882a593Smuzhiyun debugfs_create_file("icache", S_IRUSR, arch_debugfs_dir,
115*4882a593Smuzhiyun (void *)CACHE_TYPE_ICACHE, &cache_debugfs_fops);
116*4882a593Smuzhiyun return 0;
117*4882a593Smuzhiyun }
118*4882a593Smuzhiyun module_init(cache_debugfs_init);
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
121